Cushioned valve tappet



J. c. MILLER- CUSHIONED'VALVE TAPPET Filed" Nov. 2o. 1925y vPatentedv Aug. 4, 1925.

JACOB C. MILLER, OFMILWAUKEE, WISCONSIN.

.f cUsHIoNED VALVE Turm'.

Application, med Nyemb'er zo, 1923. Serial iro. 675,821.

lo all whom/ib may concern/L" Be it known that I, JACOB C. Minima, a citizen of the United States, and a resident of the city of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Cushioned Valve Tappets; and I do declare the following to be a clear, exact,l

and complete description thereof, such as will enable persons skilled in the art to which my rinvention pertains to make and u se the same, reference Abeing had to the acuntil the flexibility of the lamination is :ab- A sorbed. The thrust of the tappet isthen transferred through the valve stem and the interposed cushioning device as one part.

The novel features of my invention will 6o be pointed out in the appendedclaims.

In the accompanying-drawing: Y Figure 1 is a vertical sectional view through my improved silencer shown in its normal position interposedbetween the adqu;k

jacent ends of the divided valve stem.

Fig. 2-is a similar view showing liow the plane 'of the lamination is distorted under the ressure 'exerted by the tappet.

Fig. 3 is a vertical section through a modi- 7o The invention is an improvement upon the fied form of my invention. similar device disclosed in my application In the drawing the numerals 10 and 11 filed April23, 1923, Serial No. 634,144. indicate vthe two aligned parts of a divided The present invention resides in a silencer valve stem, such valve stem being arranged 2O for the valve tappets of internal combustion as usual and operated by the customary y enginesfand is comprised ina unit in which tappet mechanism. The numeral 12 indi# the elements areassembled. The construccates an annular body provided upon one tion of the lsaid unit is such that when the of its sides with a recess in which are placed r elements are assembled in their several rela a -plurality of laminations 13 and a rigid tions such relationsare maintained at ,all times thereafter. This arrangement permits the handling and lplacing of the valve v silencers without liability to disarrangement of any oit-its parts. 30

companying drawing as illustrating some forms 1n which my invention has been em- 15 bodied.

position in the recess by forming `an in-4 turned flange 15 upon the circular wall surrounding the said recess. In this manner the parts are incorporated into a device having a unitary structure.

The annular member 12 is bored centrally as at 16 so that one of the parts Vof the valve stem may Spass therethrough and ybear against one of the pluralnuinber of laminations v13. The rigid member 14 is formed 90 as a disk of nonyielding material and is dished in the manner shown so as to provide a circular border or ring which is convex in its cross section, as shown at 17. The

The device comprises a resilient pressure 35 member adaptedior insertion between the adjacent' ends of 1 lie, divided valve rod, and is composed of a plurality of laminated disks which in theirl` normali state are endowed with initial resistance sufiicient to maintain the separation ofthe vsaid ends and -hold the valve stem against its actuating tappet:y The end of one ofthe parts of the divided valve rod is, adapted to .bear againstl the outer one of lthe resilient disks atlits center. The disk at the other side of the lamination is adapted to bear upon the rim of a dished member having a circular surface which is convex upon all radial lines. The result of the bottom of the dish and the lamination. The part 10 of the valve stem` is adapted to'bear at its end upon the outer side of the dished disk'14, as shown in Figs. 1 and 2.

It will be seen that with the parts in nor- 100 member 14, the said part-'s being secured in'so arrangement provides a clearance between 95 this arrangement permits the resilient lamination to he ilexedl slightly upon the first application of pressure by the valve stem,

but with the increased :pressure exerted, the resistance likewise increases byreason of the correspondingly decreasing distance between the points of contact at the opposite sides of the lamination. With the shortened leverage thus created, astlie circular line of contact of the lamination with the convex sur# #am mima Mama. theresistance is increased mal position the lamination bears at its outer bordertagainst the rim of the dish, and that the same may be flexed under a slight pressure exerted upon the part 11 of the valve stem. As the pressure increases the line of stem. The operation is illustrated in Fig.

2, from which it will be seen that the area of circular pressure is reduced to the diameter indicated by the arrows anddefined by the vertical dotted lines.

` The resiliency thus provided for in the interposed connection acts effectively to eliminate the tapping noise incident to the operation of valve actuating mechanisms as usuall constructed.

In ig. 3 I have shown a modification of the construction, but with the use of which the same desirable results are attained. The annular member 12 is threaded in the central bore thereof and is adapted to be receved upon the threaded end of one of the sections of the valve rod, whereby the device may be readily adjusted to take up any slack and render its operation more effective. A lock nut 18 on the threaded end of the valve stem will engage the annular body 12 to hold it in the position to which it has been adjusted.A One face of the annular part 12 is recessed to receive the lamination 13 in the manner before described, and the bottom of the recess is formed with a circular surface which is convex as at 17 in all cross sections, the laminations shifting their line of circular contact with the convex surface, under pressure exerted by the tappet, in the manner described hereinbefore with reference to the nonyielding disk 14.

The specific form of the device shown in Fig. 3 is the subject matter of a divisional application filed by me on June 5, 1925, Serial No. 35,185.

Having thus described my invention, what I claim and desire to secure by Letters Patent of the United States, is:

. 1. In an internal combustion engine, a divided valve stem, and a cushioning device interposed between the sections thereof, such cushioning device comprising a recessed body and a resilient lamination in such recess, with a rigid circular surface convex in radial section contracting with variable pressure upon one side of the lamination,

and the contiguous end of one of the valve.

stem sections upon the other.

2. In an internal-combustion engine, a divided valve stem, and a cushioning device interposed between the sections thereof, such device comprising a recessed body and a resilient lamination in the recess, and means for securing the lamination in position, with a rigid circular surface convex in radial section contacting with variable pressure upon one side of the lamination, and the contiguous end of one of the valve stem sections upon, the other.

3. In an internal combustion engine, a divided valvestem, and a cushioning device interposed between the sections thereof, such device comprising a recessed body provided with a central bore, a lamination in the recess and a rigid dished discthereover, the disc having a circular surface convex in radial section, with the contiguous end of one of the sections of the valve stem ex'- tending through the bore and contacting with the lamination, and the end of the other section of the valve stem contacting with the outer side of the said disc.

4. A cushioning device for the-valve mechanisrn of an internal combustion engine,-

such device comprising a` body having a recess upon one side, a resilient lamination in the said recess, and a non-yielding disc having acircular surface convex in crosssection adjacent one side of the lamination upon which the lamination is adapted to bear with variable resistance when pressure is exerted upon the other side of the lamination, and means for securing the lamination in the recess.

y In testimony whereof, I have signed my name at Milwaukee, this 15th day of November, 1923.

J. C. MILLER.

Witnesses:

W. F. WooLARn, EMMA HAUG. 

